Add header documentation for pipeline.py

feat(phase-32): rebuild AliasGraph in pipeline after entity resolution

fix(api+graph+pipeline): M-04+M-05+M-08+M-09 -- misc medium fixes

fix(scrapers+pipeline): H-03+L-02+H-12 -- MyNeta elections and git bloat

fix(api+pipeline): C-05+C-06 -- unsearchable nodes and hardcoded ICIJ names

refactor(pipeline): upgrade EntityResolver import to v2

fix(encoding): strip non-ASCII chars from pipeline.py and loader.py

fix(pipeline): BUG-13 — entity resolver now runs on international data

feat: Procurement DNA + Cartel Detection + full pipeline fix

fix: complete pipeline - pull correct scraper versions into branch